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Callstack is a React and React Native consultancy that builds and improves cross-platform mobile and web apps, and contributes heavily to the React Native open-source ecosystem. It now also offers what it calls agentic delivery, using AI agents in its engineering work. Callstack.io Sp. z o.o. is registered at Prosta 36 in Wroclaw, Poland, and its site states ISO 27001 certification.
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Product design and software company with offices in Chicago and Berlin.
Founded Est. 2010
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Software and AI company building AI agents and automation for banks, insurers and fintechs.
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App and software company with 400-plus engineers and a major React Native open-source contributor.
Founded Est. 2012250–999 staff
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